Discussion Overview
The discussion revolves around the comparison of time of flight for photons and electrons, particularly in astrophysical contexts. Participants explore the implications of mass on travel speed, the effects of energy on time delays, and potential sources of data for these comparisons.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- Some participants note that photons, having no mass, travel at the speed of light (c), while electrons, being massive, travel at speeds less than c, suggesting a fundamental difference in their time of flight.
- One participant proposes that the delay in arrival times of massive particles and photons from a distant astronomical source should correlate with their energy, referencing the E(v) relation from Special Relativity.
- Concerns are raised about the dispersion of charged particles compared to neutral particles, with a mention of the longer lifetimes of certain particles like electrons and protons, while noting the short lifetime of neutrons.
- Another participant provides a specific example, stating that solar wind electrons travel at 400-750 km/s, which is significantly slower than the speed of light, leading to a much longer travel time compared to photons from the Sun.
- A later reply questions the necessity of focusing on astrophysical sources, suggesting that similar observations could be made in particle accelerators, where light is observed before charged particles during events like arcing.
Areas of Agreement / Disagreement
Participants express differing views on the relevance of astrophysical sources versus experimental settings, and there is no consensus on the implications of the time of flight differences between photons and electrons.
Contextual Notes
Participants acknowledge various factors that could affect the comparison, such as the energy of the particles, their dispersion, and the specific conditions under which they are emitted. The discussion does not resolve these complexities.
Who May Find This Useful
Readers interested in the physics of particle dynamics, astrophysics, and the implications of mass on travel speeds may find this discussion relevant.